Richard david sanders



(No Model.)

B. D. SANDERS. MANUFACTURE OF WIRE STRIPS OR THE LIKE BYELEGTRODEI-OSITION.

No. 525,800. Patented se t. 11, 1894.

fl z'fhesses.

UNITED STATES PATENT OFFICE.

RICHARD DAVID SANDERS, OF EASTBOURNE, ENGLAND.

MANUFACTURE OF WIRE STRlPS OR THE LIKE BY ELECTRODEPOSITION.

SPECIFICATION forming part of Letters Patent No. 525,800, datedSeptember 11, 1894.

Application filed August 3, 1892. Serial 110.442.076. (N0 specimens.)Patented in England May 8, 1891, No. 7,960; in Belgium February 1'7,1892, No. 98,407, and in France February 20, 1892,1 T0- 219.566-

To all whom it may concern:

Be it known that I, RICHARD DAVID SAN- DERS, a subject of the Queen ofGreat Britain, residing at Eastbourne, England, have invented new anduseful Improvements in the Manufacture of Wire Strips or the Like byElectrodeposition, (for which I have obtained Letters Patent in GreatBritain, dated May 8, 1891, No. 7,960; in Belgium, dated February 17,1892, No. 98,407, and in France, dated Febmany 20, 1892, No. 219,566,)of which the following is a specification.

My invention relates to improvements in the manufacture of wire stripsand the like by electro-deposition upon a grooved, spiral or helicalsurface, or mandrel, as hereinafter more particularly described. Indepositing metal upon such surfaces as hitherto construoted a difficultyhas been experienced in confining the deposit to the metallic ordepositing surfaces or grooves and as a consequence the metal isdeposited in irregular shapes unsuitable for commercial purposes.

The object of my invention is to provide means whereby on a metallicsurface of the kind hereinbefore described a wire or strip ofpractically uniform thickness and form may be obtained.

In carrying out my invention I place the insulating material so that themetallic surface on which the deposit is made is not the full width'ofthe bottom of the groove or depositing surface, whereby as the depositgrows the side clearance spaces will allow the strips to broaden as thethickening proceeds.

To enable my invention to be fully understood I will proceed to describehow the same can be carried into practice by reference to theaccompanying drawings, in which- Figures 1, 2, and 3 are sections ofparts of mandrels constructed according to my invention and adapted forthe manufacture of square or fiat strips or wires.

In the arrangement shown in Fig. 1, a represents a metal cylinder uponthe surface of which I cut or form a thread 19, and in the groove formedbetween the threads I introduce a strip f of insulating material leavingclearance spaces (1, d between the sides of the metal thread and thesides of the insulating strip which spaces (1,61 are filled up withbitumen, wax or other suitable material and turned down to a smoothsurface as shown.

The object of these clearance spaces d, (1 is to prevent the metalcreeping up the sides of the insulator before the required thickness hasbeen deposited.

c, on all the figures, indicates the electro deposit.

It will be understood that deposition first takes place upon the metalsurface I) and as it grows in thickness it also grows in width. Iftherefore the clearance on either side of the depositing surface issufficient, the deposited metal, by the time it has increased in widthto fill the groove laterally, will have also attained a sufficientthickness vertically to form an approximately square section which canthen be removed before rough edges are formed by the metal creeping upthe sides of the insulator as before explained.

A further object of my clearance spaces is to afford facility for theinsertion of a suitable stopping to prevent the cupreous solutiongetting to the metallic surface of the cylinder under the insulator.

In Figs. 2 and 3 the arrangement is practically the same as in Fig. 1except that in place of cutting a spiral thread or groove in a metalcylinder I form the same by winding metal and gutta-percha or othersuitable strips 1) round the mandrel a which may be of any suitablenon-conducting material, such strips being of sections substantially asshown whereby the depositing surface and clearance spaces are obtainedfor the purposes as already explained.

In Fig. 3, the bitumen filling is not shown, but the insulating strip fhas an offset g, at each of its sides, occupying the same space as doesthe bitumen or other filling shown at d, d, in Fig. 2.

When depositing surfaces are obtained by using long strips I find thedeposit is irregular in thickness. I therefore, before applying thestrips, cover the mandrel with some suitable metallic foil e by whichthe electric current is evenly distributed and a uniform depositobtained over the entire exposed depositing surface. The cathodes thusformed are immersed in a cupreous solution and subieeted to an lectriccurrent in the ordinary way and the deposit when large enough can beeasily removed from the cathode and drawn into wire in the ordinarymanner.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- A mandrel for the manufacture by electrodeposition of acontinuous strip of metal,

[0 havinga spiral groove the base of which consists of an intermediateconduction portion and of insulating portions at each side of the same,the side walls of the groove being, also of insulating material.

7 RICHARD DAVID SANDERS.

\Vitnesses:

G. F. REDFERN, JOHN E. BOUSFIELD, Ofhe firm of G. F. .Reclfev'n 1: 00.,4 South Street, Finsbury, London, Patent Agents.

